Hundreds of English-language biographical reference books devoted to women subjects were published between 1966 and 2006. These works compensated for underrepresentation of women in standard sources and responded to the intense interest in women's lives on the part of feminist scholars. The findings in this article are derived from a bibliographic database that includes works limited by nationality, race, occupation, and other factors, as well as general biographical dictionaries. A decade-by-decade analysis reveals trends in subject content that parallel developments in the scholarly field of women's studies and the public arena. Problems with duplicative content, subjectivity, and factual errors are described, and points for evaluation are recommended. As biographical information about women is increasingly available on the open Web, questions remain about the nature and future of this type of information source.